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Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Schedule of Interest Rate Derivatives [Table Text Block]

The following table sets forth information for each of the Company’s interest rate swap agreements outstanding as of June 30, 2019 and December 31, 2018. All dollar amounts are in thousands.

		Notional											Fair Value Asset (Liability)
Hedge Type		Amount at June 30, 2019			Origination Date		Maturity Date		Swap Fixed Interest Rate				June 30, 2019				December 31, 2018
Cash flow hedge		$	212,500		5/21/2015		5/18/2020			1.58	%		$	565			$	2,744
Cash flow hedge			110,000		7/2/2015		5/18/2020			1.62	%			255				1,361
Cash flow hedge			50,000		4/7/2016		3/31/2021			1.09	%			519				1,519
Cash flow hedge			100,000		4/7/2016		3/31/2023			1.33	%			1,010				4,477
Cash flow hedge			75,000		5/31/2017		6/30/2024			1.96	%			(1,200	)			1,905
Cash flow hedge			10,000		8/10/2017		6/30/2024			2.01	%			(180	)			226
Cash flow hedge ⁽¹⁾			50,000		6/1/2018		6/30/2025			2.89	%			(3,551	)			(1,276	)
Cash flow hedge ⁽²⁾			25,000		12/6/2018		6/30/2025			2.75	%			(1,466	)			(379	)
Cash flow hedge ⁽³⁾			50,000		12/7/2018		1/31/2024			2.72	%			(2,110	)			(571	)
		$	682,500										$	(6,158	)		$	10,006

(1)	In June 2018 the Company entered into a forward interest rate swap agreement with a commercial bank, which beginning January 31, 2019 effectively fixes the interest rate on $50 million of the Company's variable-rate debt.

(2)	In December 2018 the Company entered into a forward interest rate swap agreement with a commercial bank, which beginning January 31, 2020 will effectively fix the interest rate on $25 million of the Company's variable-rate debt.

(3)	In December 2018 the Company entered into a forward interest rate swap agreement with a commercial bank, which beginning May 18, 2020 will effectively fix the interest rate on $50 million of the Company's variable-rate debt.

Derivative Instruments, Gain (Loss) [Table Text Block]

The following table presents the effect of derivative instruments in cash flow hedging relationships in the Company’s consolidated statements of operations and comprehensive income for the three and six months ended June 30, 2019 and 2018 (in thousands):

		Net Unrealized Gain (Loss) Recognized in Other Comprehensive Income (Loss)								Net Unrealized Gain Reclassified from Accumulated Other Comprehensive Income (Loss) to Interest and Other Expense, net
		Three Months Ended June 30,								Three Months Ended June 30,
		2019				2018				2019				2018
Interest rate derivatives in cash flow hedging relationships		$	(8,898	)		$	2,252			$	1,222			$	512

		Net Unrealized Gain (Loss) Recognized in Other Comprehensive Income (Loss)								Net Unrealized Gain Reclassified from Accumulated Other Comprehensive Income (Loss) to Interest and Other Expense, net
		Six Months Ended June 30,								Six Months Ended June 30,
		2019				2018				2019				2018
Interest rate derivatives in cash flow hedging relationships		$	(13,668	)		$	8,600			$	2,496			$	568